Wheelchair base frame



FIG. 1 is a planar view of my wheelchair base frame, shown from above;

FIG. 2 is a perspective view of my wheelchair base frame, shownobliquely from the rear side and slightly from above;

FIG. 3 is a side view of my wheelchair base frame, from the right side;

FIG. 4 is a planar view of my wheelchair base frame, shown from below,and from the opposite side as compared to the view shown in FIG. 1.

FIG. 5 is a front view of my wheelchair base frame; and,

FIG. 6 is a side view of my wheelchair base frame, from the left side,and from the opposite side as compared to the view shown in FIG. 3.

The ornamental design for a wheelchair base frame, as shown anddescribed.